You have agreed to play relatively 'normal' methods - responder's new suit in competition is forcing for one round, as 2♠ is in the above auction. Six spades and nine points might be a typical minimum holding for 2♠.

What do opener's 3♦ and (jump to) 4♦ bids mean?

3♦ is natural and responder can pass. 4♦ is a splinter agreeing spades.

3♦ is natural and responder can pass. 4♦ is natural and stronger (forcing).

3♦ is natural, but responder must bid again. 4♦ is a splinter agreeing spades.

3♦ is natural, but responder must bid again. 4♦ is natural and stronger (forcing).

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